Question

from the sum of x²+x+1and x²-x+1, subtract - x²-x+1 ​

Answer 1

Step-by-step explanation:

$(( {x}^{2} + x + 1) + ( {x}^{2} - x + 1)) - ( - {x}^{2} - x + 1) \\ 2 {x}^{2} + 2 + {x}^{2} + x - 1 \\ = 3 {x}^{2} + x + 1$